CN113336488A - Low-segregation and low-carbon concrete and preparation method thereof - Google Patents
Low-segregation and low-carbon concrete and preparation method thereof Download PDFInfo
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- CN113336488A CN113336488A CN202110776206.3A CN202110776206A CN113336488A CN 113336488 A CN113336488 A CN 113336488A CN 202110776206 A CN202110776206 A CN 202110776206A CN 113336488 A CN113336488 A CN 113336488A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/001—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing unburned clay
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- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
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- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/08—Diatomaceous earth
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- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0625—Polyalkenes, e.g. polyethylene
- C04B16/0633—Polypropylene
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- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
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- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
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- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
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- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
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- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/146—Silica fume
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- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
- C04B22/142—Sulfates
- C04B22/148—Aluminium-sulfate
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- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/04—Carboxylic acids; Salts, anhydrides or esters thereof
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- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/08—Fats; Fatty oils; Ester type waxes; Higher fatty acids, i.e. having at least seven carbon atoms in an unbroken chain bound to a carboxyl group; Oxidised oils or fats
- C04B24/085—Higher fatty acids
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- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
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- C04B24/383—Cellulose or derivatives thereof
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- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/46—Water-loss or fluid-loss reducers, hygroscopic or hydrophilic agents, water retention agents
- C04B2103/465—Water-sorbing agents, hygroscopic or hydrophilic agents
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses low-segregation and low-carbon concrete, and particularly relates to the technical field of concrete, wherein the concrete comprises the following raw materials: cementing materials, mixed aggregates, additives and water; the cementing material comprises the following raw materials: slag powder, fly ash, nano clay, metakaolin, silicon powder, polypropylene fiber and iron ore powder. The invention utilizes the cementing material to replace the traditional portland cement, the cementing material comprises slag powder, fly ash, nano clay, metakaolin, silica powder, polypropylene fiber and iron ore powder, a great amount of solid wastes such as the slag powder and the like are utilized, the environment-friendly benefit is achieved, the silica powder and the nano clay are added and mixed to form a micro aggregate mixture with reasonable particle size distribution, the strength of the concrete is kept in the construction requirement, and the metakaolin enables the performances such as weather resistance, strength, sulfate corrosion resistance and the like of the concrete to be improved.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to low-segregation and low-carbon concrete and a preparation method thereof.
Background
The concrete is a general term of engineering composite materials formed by cementing aggregates into a whole by cementing materials, and has the characteristics of rich raw materials, low price and simple production process, so that the consumption of the concrete is increased more and more. Meanwhile, the concrete also has the characteristics of high compressive strength, good durability, wide strength grade range and the like. These characteristics make it widely used not only in various civil engineering, but also in shipbuilding, machinery, marine development, geothermal engineering, etc., and concrete is also an important material. With the continuous development of concrete composition materials, the performance requirements of people on concrete are not limited to compressive strength, but on the basis of the strength, the balance and coordination of comprehensive indexes such as durability, deformation performance, fire and explosion resistance, water seepage resistance, toughness, corrosion resistance, heat preservation, health and environmental protection, cost reduction and the like of heavy concrete are further added. The requirements of various performance indexes of the concrete are more definite, detailed and concrete than before. Meanwhile, the horizontal lifting of the construction equipment and the continuous emergence and popularization of a novel construction process enable the concrete technology to adapt to different design, construction and use requirements, and the development is fast.
The segregation of concrete is the phenomenon that the cohesive force among the concrete mixture components is not enough to resist the sinking of coarse aggregates, and the components of the concrete mixture are separated from each other to cause the internal components and the structure to be uneven. It is common to present coarse aggregate separated from the mortar, such as dense particles deposited at the bottom of the mix, or coarse aggregate separated from the mix as a whole. The segregation may be caused by pouring, improper vibration, too large a maximum aggregate particle size, too high a coarse aggregate proportion, too low a content of cementitious material and fine aggregate, too high a density with respect to the coarse aggregate as compared to the fine aggregate, or too dry or too dilute a mixture, etc.
The existing concrete is mostly made of Portland cement, the adopted cement consumes huge natural resources, damages the environment and influences the ecological balance of the earth, and especially the emission of CO2 in the cement production usually accounts for 5-10% of the emission of human active carbon. The cement industry is a main source of carbon emission in China, the carbon emission accounts for about 15%, and CO2 is emitted from cement raw materials about 511kg when 1 ton of portland cement is produced. Therefore, the cement industry is a genuine big house of carbon emissions. The discharge of a large amount of carbon dioxide not only destroys the living environment of human beings, but also greatly harms the health of human beings; and the existing concrete segregation phenomenon is serious, which leads to the lower service life of the concrete.
Disclosure of Invention
In order to overcome the above defects in the prior art, embodiments of the present invention provide a low segregation, low carbon concrete and a method for preparing the same, and the present invention aims to solve the following problems: how to reduce the carbon discharge amount in the concrete production and reduce the segregation phenomenon of the concrete.
In order to achieve the purpose, the invention provides the following technical scheme: the low-segregation and low-carbon concrete comprises the following raw materials in parts by weight: 400 portions of cementing material, 1300 portions of mixed aggregate, 1600 portions of additive and 180 portions of water; the cementing material comprises the following raw materials in parts by weight: 20-40 parts of slag powder, 30-50 parts of fly ash, 5-10 parts of nano clay, 5-10 parts of metakaolin, 10-18 parts of silicon powder, 10-15 parts of polypropylene fiber and 10-15 parts of iron ore powder.
In a preferred embodiment, the feed comprises the following raw materials in parts by weight: 480-520 parts of cementing material, 1400-1500 parts of mixed aggregate, 45-55 parts of additive and 170 parts of water; the cementing material comprises the following raw materials in parts by weight: 25-35 parts of slag powder, 35-45 parts of fly ash, 6-8 parts of nano clay, 5-8 parts of metakaolin, 13-15 parts of silicon powder, 12-13 parts of polypropylene fiber and 12-13 parts of iron ore powder.
In a preferred embodiment, the feed comprises the following raw materials in parts by weight: 500 parts of cementing material, 1450 parts of mixed aggregate, 50 parts of additive and 160 parts of water; the cementing material comprises the following raw materials in parts by weight: 30 parts of slag powder, 40 parts of fly ash, 7 parts of nano clay, 7 parts of metakaolin, 14 parts of silicon powder, 13 parts of polypropylene fiber and 13 parts of iron ore powder.
In a preferred embodiment, the mixed aggregate comprises coarse aggregate and fine aggregate, and the weight ratio of the coarse aggregate to the fine aggregate is 1: (0.8-1.4), the coarse aggregate is one or a mixture of more of broken stones, crushed pebbles and blast furnace heavy slag, and the fine aggregate comprises coarse sand, medium sand, fine sand and extra fine sand.
In a preferred embodiment, the additive comprises a defoaming agent, a thickening agent, a water-retaining agent and a reinforcing agent, and the weight ratio of the defoaming agent to the thickening agent to the water-retaining agent to the reinforcing agent is 1: (1.2-1.4): (1-1.2), the defoaming agent is an organic silicon defoaming agent, the thickening agent is one of pectin, agar, gelatin and seaweed gel, and the water-retaining agent is prepared from the following raw materials in parts by weight: 10-20 parts of hydroxypropyl methyl cellulose, 5-10 parts of diatomite, 5-8 parts of glyceryl monostearate, 10-15 parts of 2-acrylamide-2-methylpropanesulfonic acid, 2-6 parts of acrylic acid and 2-6 parts of calcium sulphoaluminate, wherein the reinforcing agent is natural latex.
The invention also provides a preparation method of the low-segregation and low-carbon concrete, which comprises the following specific preparation steps:
the method comprises the following steps: weighing raw materials according to the weight ratio of the gel material, putting the weighed slag powder, fly ash, nano clay and polypropylene fiber into a mixing device, stirring and mixing uniformly, then putting into a pulverizer for pulverizing, adding metakaolin, silicon powder and iron ore powder after the pulverizing is finished, stirring and mixing uniformly to obtain the gel material;
step two: adding one third of water into the gel material obtained in the step one, uniformly stirring to obtain a gel liquid, then adding mixed aggregate into the gel liquid, uniformly stirring and mixing, then adding two thirds of water and a defoaming agent, continuously stirring, sequentially adding a thickening agent and a reinforcing agent in the stirring process, and continuously uniformly stirring to obtain a mixture;
step three: and weighing the raw materials in the water-retaining agent, stirring and mixing uniformly, adding into the mixture obtained in the second step, and stirring uniformly to obtain the low-segregation and low-carbon concrete.
In a preferred embodiment, the grinding machine in the first step is used for grinding and then screening with a 150-mesh sieve of 100-.
In a preferred embodiment, the stirring speed after one third of the water is added in the second step is 600-800 rpm, and the mixed aggregate needs to be uniformly mixed before being added into the gel liquid.
In a preferred embodiment, the stirring rate during the addition of the thickening agent and the strengthening agent in the second step is 200-400 rpm, and the stirring rate during the continuous stirring after the addition of the thickening agent and the strengthening agent is 800-1000 rpm.
In a preferred embodiment, the stirring speed of the water-retaining agent and the mixture in the third step is 600-800 rpm, and the stirring time is 20-40 minutes.
The invention has the technical effects and advantages that:
1. the low-segregation and low-carbon concrete prepared by the raw material formula of the invention utilizes the cementing material to replace the traditional portland cement, the cementing material comprises slag powder, fly ash, nano-clay, metakaolin, silicon powder, polypropylene fiber and iron ore powder, a great amount of solid wastes such as the slag powder and the like are utilized, the environment-friendly benefit is achieved, the silicon powder and the nano-clay are added and mixed to form a micro-aggregate mixture with reasonable particle grading, the strength of the concrete keeps the construction requirement, the metakaolin enables the performances such as weather resistance, strength, sulfate corrosion resistance and the like of the concrete to be improved, the polypropylene fiber can greatly improve the anti-cracking and anti-permeability performance and the anti-scouring performance of the concrete/mortar, the toughness of the concrete is increased, the service life of the concrete is prolonged, the concrete produced by the invention has low-carbon emission while the performance of the concrete is ensured, the environment-friendly effect is better;
2. according to the invention, the mixed aggregate is adopted and comprises coarse aggregate, coarse sand, medium sand, fine sand and extra fine sand, so that the interior of the concrete is densely filled, and hydroxypropyl methyl cellulose, diatomite, glyceryl monostearate, 2-acrylamide-2-methylpropanesulfonic acid, acrylic acid and calcium sulphoaluminate are added into the water-retaining agent, so that the cohesiveness of the concrete can be improved, the good workability of the concrete is ensured, the shrinkage of the concrete is reduced, the volume stability of the concrete is improved, and the crack resistance of the concrete is enhanced.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the invention provides low-segregation and low-carbon concrete which comprises the following raw materials in parts by weight: 400 parts of cementing material, 1300 parts of mixed aggregate, 40 parts of additive and 130 parts of water; the cementing material comprises the following raw materials in parts by weight: 20 parts of slag powder, 30 parts of fly ash, 5 parts of nano clay, 5 parts of metakaolin, 10 parts of silicon powder, 10 parts of polypropylene fiber and 10 parts of iron ore powder.
In a preferred embodiment, the mixed aggregate comprises coarse aggregate and fine aggregate, and the weight ratio of the coarse aggregate to the fine aggregate is 1: 1.2, the coarse aggregate is one or a mixture of more of broken stones, broken pebbles and blast furnace heavy slag, and the fine aggregate comprises coarse sand, medium sand, fine sand and extra-fine sand.
In a preferred embodiment, the additive comprises a defoaming agent, a thickening agent, a water-retaining agent and a reinforcing agent, and the weight ratio of the defoaming agent to the thickening agent to the water-retaining agent to the reinforcing agent is 1: 1.3: 1.1, the defoaming agent is an organic silicon defoaming agent, the thickening agent is one of pectin, agar, gelatin and seaweed gel, and the water-retaining agent is prepared from the following raw materials in parts by weight: 15 parts of hydroxypropyl methyl cellulose, 8 parts of diatomite, 7 parts of glyceryl monostearate, 13 parts of 2-acrylamide-2-methylpropanesulfonic acid, 4 parts of acrylic acid and 4 parts of calcium sulphoaluminate, wherein the reinforcing agent is natural latex.
The invention also provides a preparation method of the low-segregation and low-carbon concrete, which comprises the following specific preparation steps:
the method comprises the following steps: weighing raw materials according to the weight ratio of the gel material, putting the weighed slag powder, fly ash, nano clay and polypropylene fiber into a mixing device, stirring and mixing uniformly, then putting into a pulverizer for pulverizing, adding metakaolin, silicon powder and iron ore powder after the pulverizing is finished, stirring and mixing uniformly to obtain the gel material;
step two: adding one third of water into the gel material obtained in the step one, uniformly stirring to obtain a gel liquid, then adding mixed aggregate into the gel liquid, uniformly stirring and mixing, then adding two thirds of water and a defoaming agent, continuously stirring, sequentially adding a thickening agent and a reinforcing agent in the stirring process, and continuously uniformly stirring to obtain a mixture;
step three: and weighing the raw materials in the water-retaining agent, stirring and mixing uniformly, adding into the mixture obtained in the second step, and stirring uniformly to obtain the low-segregation and low-carbon concrete.
In a preferred embodiment, the grinding machine in the first step is used for grinding and then screening with a 100-mesh and 150-mesh sieve, the metakaolin in the first step is metakaolin ultrafine powder, and the stirring speed during stirring and mixing in the first step is 700 rpm.
In a preferred embodiment, the stirring speed is 700 r/min after one third of water is added in the second step, and the mixed aggregate needs to be uniformly mixed before being added into the gel liquid.
In a preferred embodiment, the stirring rate in the second step is 300 rpm when the thickener and the strengthening agent are added, and the stirring rate in the second step when the stirring is continued after the thickener and the strengthening agent are added is 900 rpm.
In a preferred embodiment, the stirring speed of the water retention agent and the mixture in the third step is 700 rpm, and the stirring time is 30 minutes.
Example 2:
different from the embodiment 1, the low-segregation and low-carbon concrete comprises the following raw materials in parts by weight: 500 parts of cementing material, 1450 parts of mixed aggregate, 50 parts of additive and 160 parts of water; the cementing material comprises the following raw materials in parts by weight: 30 parts of slag powder, 40 parts of fly ash, 7 parts of nano clay, 7 parts of metakaolin, 14 parts of silicon powder, 13 parts of polypropylene fiber and 13 parts of iron ore powder.
Example 3:
different from the embodiments 1-2, the low-segregation and low-carbon concrete comprises the following raw materials in parts by weight: 600 parts of a cementing material, 1600 parts of mixed aggregate, 60 parts of an additive and 180 parts of water; the cementing material comprises the following raw materials in parts by weight: 40 parts of slag powder, 50 parts of fly ash, 10 parts of nano clay, 10 parts of metakaolin, 18 parts of silicon powder, 15 parts of polypropylene fiber and 15 parts of iron ore powder.
Example 4:
the low-segregation and low-carbon concrete comprises the following raw materials in parts by weight: 400 parts of cementing material, 1300 parts of mixed aggregate, 40 parts of additive and 130 parts of water; the cementing material comprises the following raw materials in parts by weight: 20 parts of slag powder, 30 parts of fly ash, 5 parts of nano clay, 5 parts of metakaolin, 10 parts of silicon powder, 10 parts of polypropylene fiber and 10 parts of iron ore powder.
In a preferred embodiment, the mixed aggregate comprises coarse aggregate and fine aggregate, and the weight ratio of the coarse aggregate to the fine aggregate is 1: 1.2, the coarse aggregate is one or a mixture of more of broken stones, broken pebbles and blast furnace heavy slag, and the fine aggregate comprises coarse sand, medium sand, fine sand and extra-fine sand.
In a preferred embodiment, the additive comprises a defoaming agent, a thickening agent, a water-retaining agent and a reinforcing agent, and the weight ratio of the defoaming agent to the thickening agent to the water-retaining agent to the reinforcing agent is 1: 1.3: 1.1, the defoaming agent is an organic silicon defoaming agent, the thickening agent is one of pectin, agar, gelatin and seaweed gel, and the water-retaining agent is prepared from the following raw materials in parts by weight: 10 parts of hydroxypropyl methyl cellulose, 5 parts of diatomite, 5 parts of glyceryl monostearate, 10 parts of 2-acrylamide-2-methylpropanesulfonic acid, 2 parts of acrylic acid and 2 parts of calcium sulphoaluminate, wherein the reinforcing agent is natural latex.
The invention also provides a preparation method of the low-segregation and low-carbon concrete, which comprises the following specific preparation steps:
the method comprises the following steps: weighing raw materials according to the weight ratio of the gel material, putting the weighed slag powder, fly ash, nano clay and polypropylene fiber into a mixing device, stirring and mixing uniformly, then putting into a pulverizer for pulverizing, adding metakaolin, silicon powder and iron ore powder after the pulverizing is finished, stirring and mixing uniformly to obtain the gel material;
step two: adding one third of water into the gel material obtained in the step one, uniformly stirring to obtain a gel liquid, then adding mixed aggregate into the gel liquid, uniformly stirring and mixing, then adding two thirds of water and a defoaming agent, continuously stirring, sequentially adding a thickening agent and a reinforcing agent in the stirring process, and continuously uniformly stirring to obtain a mixture;
step three: and weighing the raw materials in the water-retaining agent, stirring and mixing uniformly, adding into the mixture obtained in the second step, and stirring uniformly to obtain the low-segregation and low-carbon concrete.
In a preferred embodiment, the grinding machine in the first step is used for grinding and then screening with a 100-mesh and 150-mesh sieve, the metakaolin in the first step is metakaolin ultrafine powder, and the stirring speed during stirring and mixing in the first step is 700 rpm.
In a preferred embodiment, the stirring speed is 700 r/min after one third of water is added in the second step, and the mixed aggregate needs to be uniformly mixed before being added into the gel liquid.
In a preferred embodiment, the stirring rate in the second step is 300 rpm when the thickener and the strengthening agent are added, and the stirring rate in the second step when the stirring is continued after the thickener and the strengthening agent are added is 900 rpm.
In a preferred embodiment, the stirring speed of the water retention agent and the mixture in the third step is 700 rpm, and the stirring time is 30 minutes.
Example 5:
different from the embodiment 4, the water-retaining agent is prepared from the following raw materials in parts by weight: 20 parts of hydroxypropyl methyl cellulose, 9 parts of diatomite, 8 parts of glyceryl monostearate, 14 parts of 2-acrylamide-2-methylpropanesulfonic acid, 6 parts of acrylic acid and 6 parts of calcium sulphoaluminate.
The low-segregation and low-carbon concretes prepared in the above examples 1 to 5 were respectively used as an experimental group 1, an experimental group 2, an experimental group 3, an experimental group 4 and an experimental group 5, and the tests were performed by using the conventional concrete as a control group, and the compressive strength, the impermeability grade, the slab cracking area, the 28-day carbonization depth and the slump of the selected concrete were respectively performed. The test results are shown in table one:
watch 1
As can be seen from the table I, the low-segregation and low-carbon concrete produced by the invention has better compressive strength and anti-permeability grade than the traditional concrete, the cracking area of a flat plate is smaller, the carbonization depth and the slump are reduced, so that the service life of the concrete is longer, the components of the water-retaining agent are respectively changed in the embodiment 4 and the embodiment 5, and the performance of the concrete is almost the same as that of the embodiment 1, so that the invention utilizes the cementing material to replace the traditional silicate cement, the cementing material comprises slag powder, fly ash, nano clay, metakaolin, silicon powder, polypropylene fiber and iron ore powder, a large amount of solid wastes such as slag powder and the like, has environmental protection benefit, and the silicon powder and the nano clay are added to be mixed to form a micro-aggregate mixture with reasonable particle size, so that the strength of the concrete keeps the construction requirement, and the metakaolin enables the weather resistance, the strength and the concrete to be better, The concrete produced by the invention has low carbon emission and good environmental protection effect while ensuring the performance of the concrete, the mixed aggregate comprises coarse aggregate, coarse sand, medium sand, fine sand and extra fine sand, so that the interior of the concrete is densely filled, and hydroxypropyl methyl cellulose, diatomite, glyceryl monostearate, 2-acrylamide-2-methylpropanesulfonic acid, acrylic acid and calcium sulphoaluminate are added into a water-retaining agent, so that the cohesiveness of the concrete can be improved, the concrete is ensured to have good workability, the shrinkage of the concrete is reduced, the volume stability of the concrete is improved, and the crack resistance of the concrete is enhanced.
And finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. The utility model provides a low segregation, low carbon concrete which characterized in that: the feed comprises the following raw materials in parts by weight: 400 portions of cementing material, 1300 portions of mixed aggregate, 1600 portions of additive and 180 portions of water; the cementing material comprises the following raw materials in parts by weight: 20-40 parts of slag powder, 30-50 parts of fly ash, 5-10 parts of nano clay, 5-10 parts of metakaolin, 10-18 parts of silicon powder, 10-15 parts of polypropylene fiber and 10-15 parts of iron ore powder.
2. The low segregation, low carbon concrete of claim 1, wherein: the feed comprises the following raw materials in parts by weight: 480-520 parts of cementing material, 1400-1500 parts of mixed aggregate, 45-55 parts of additive and 170 parts of water; the cementing material comprises the following raw materials in parts by weight: 25-35 parts of slag powder, 35-45 parts of fly ash, 6-8 parts of nano clay, 5-8 parts of metakaolin, 13-15 parts of silicon powder, 12-13 parts of polypropylene fiber and 12-13 parts of iron ore powder.
3. The low segregation, low carbon concrete of claim 1, wherein: the feed comprises the following raw materials in parts by weight: 500 parts of cementing material, 1450 parts of mixed aggregate, 50 parts of additive and 160 parts of water; the cementing material comprises the following raw materials in parts by weight: 30 parts of slag powder, 40 parts of fly ash, 7 parts of nano clay, 7 parts of metakaolin, 14 parts of silicon powder, 13 parts of polypropylene fiber and 13 parts of iron ore powder.
4. The low segregation, low carbon concrete of claim 1, wherein: the mixed aggregate comprises coarse aggregate and fine aggregate, and the weight ratio of the coarse aggregate to the fine aggregate is 1: (0.8-1.4), the coarse aggregate is one or a mixture of more of broken stones, crushed pebbles and blast furnace heavy slag, and the fine aggregate comprises coarse sand, medium sand, fine sand and extra fine sand.
5. The low segregation, low carbon concrete of claim 1, wherein: the additive comprises a defoaming agent, a thickening agent, a water-retaining agent and a reinforcing agent, wherein the weight ratio of the defoaming agent to the thickening agent to the water-retaining agent to the reinforcing agent is 1: (1.2-1.4): (1-1.2), the defoaming agent is an organic silicon defoaming agent, the thickening agent is one of pectin, agar, gelatin and seaweed gel, and the water-retaining agent is prepared from the following raw materials in parts by weight: 10-20 parts of hydroxypropyl methyl cellulose, 5-10 parts of diatomite, 5-8 parts of glyceryl monostearate, 10-15 parts of 2-acrylamide-2-methylpropanesulfonic acid, 2-6 parts of acrylic acid and 2-6 parts of calcium sulphoaluminate, wherein the reinforcing agent is natural latex.
6. The method for preparing low segregation, low carbon concrete according to any one of claims 1-5, wherein: the preparation method comprises the following specific steps:
the method comprises the following steps: weighing raw materials according to the weight ratio of the gel material, putting the weighed slag powder, fly ash, nano clay and polypropylene fiber into a mixing device, stirring and mixing uniformly, then putting into a pulverizer for pulverizing, adding metakaolin, silicon powder and iron ore powder after the pulverizing is finished, stirring and mixing uniformly to obtain the gel material;
step two: adding one third of water into the gel material obtained in the step one, uniformly stirring to obtain a gel liquid, then adding mixed aggregate into the gel liquid, uniformly stirring and mixing, then adding two thirds of water and a defoaming agent, continuously stirring, sequentially adding a thickening agent and a reinforcing agent in the stirring process, and continuously uniformly stirring to obtain a mixture;
step three: and weighing the raw materials in the water-retaining agent, stirring and mixing uniformly, adding into the mixture obtained in the second step, and stirring uniformly to obtain the low-segregation and low-carbon concrete.
7. The method for preparing low-segregation and low-carbon concrete according to claim 6, wherein the method comprises the following steps: and (3) after the powder is ground by the grinding machine in the first step, screening by adopting a sieve with 100-plus-150 meshes, wherein the metakaolin in the first step is the metakaolin ultrafine powder, and the stirring speed during stirring and mixing in the first step is 800 revolutions per minute at 600-plus-800 revolutions per minute.
8. The method for preparing low-segregation and low-carbon concrete according to claim 6, wherein the method comprises the following steps: and after one third of water is added in the step two, the stirring speed is 600-800 rpm, and the mixed aggregate needs to be uniformly mixed before being added into the gel liquid.
9. The method for preparing low-segregation and low-carbon concrete according to claim 6, wherein the method comprises the following steps: and the stirring speed is 200-400 r/min when the thickening agent and the strengthening agent are added in the step two, and the stirring speed is 800-1000 r/min when the thickening agent and the strengthening agent are added and the stirring is continued.
10. The method for preparing low-segregation and low-carbon concrete according to claim 6, wherein the method comprises the following steps: the stirring speed of the water-retaining agent and the mixture in the third step is 600-800 revolutions per minute, and the stirring time is 20-40 minutes.
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